What’s taking up all that place on my disk?

While I was downloading the latest version of XCode on my home machine (an old Mac Cube), I ran out of disk space. As I didn’t feel like upgrading the disk (even if I would, no stores are open at this time), I decided I’d better hunt for those files that were taking up all that diskspace. On my PC, I normally use JDiskReport from JGoodies for that, but for some reason, it didn’t want to scan my disk. However, Google found a mac specific app that seems to do the trick: Disk Inventory X. A few minutes after installing it, I’ve already managed to remove 2.5Gb of old data…